My 261 (55) was in a dump truck using the rod type mounts from the front corners of the block. There aren't any bosses drilled or not on either side of the block that look like they could be adapted to the tower mounts.
What I think I'm trying to do is use the 49-50 front mounts and the exisitng transmission mount to support the engine. Adding the 49-50 side mounts off the bell housing should take care of the torque.
I can weld or bolt some clips onto the frame for the bottom connection, but I'm not sure how to connect to the bellhousing.
Thanks. joe